git-rebase--interactive.sh

   1 #!/bin/sh
   2 #
   3 # Copyright (c) 2006 Johannes E. Schindelin
   4
   5 # SHORT DESCRIPTION
   6 #
   7 # This script makes it easy to fix up commits in the middle of a series,
   8 # and rearrange commits.
   9 #
  10 # The original idea comes from Eric W. Biederman, in
  11 # http://article.gmane.org/gmane.comp.version-control.git/22407
  12
  13 OPTIONS_KEEPDASHDASH=
  14 OPTIONS_SPEC="\
  15 git-rebase [-i] [options] [--] <upstream> [<branch>]
  16 git-rebase [-i] (--continue | --abort | --skip)
  17 --
  18  Available options are
  19 v,verbose          display a diffstat of what changed upstream
  20 onto=              rebase onto given branch instead of upstream
  21 p,preserve-merges  try to recreate merges instead of ignoring them
  22 s,strategy=        use the given merge strategy
  23 m,merge            always used (no-op)
  24 i,interactive      always used (no-op)
  25  Actions:
  26 continue           continue rebasing process
  27 abort              abort rebasing process and restore original branch
  28 skip               skip current patch and continue rebasing process
  29 "
  30
  31 . git-sh-setup
  32 require_work_tree
  33
  34 DOTEST="$GIT_DIR/rebase-merge"
  35 TODO="$DOTEST"/git-rebase-todo
  36 DONE="$DOTEST"/done
  37 MSG="$DOTEST"/message
  38 SQUASH_MSG="$DOTEST"/message-squash
  39 REWRITTEN="$DOTEST"/rewritten
  40 PRESERVE_MERGES=
  41 STRATEGY=
  42 ONTO=
  43 VERBOSE=
  44
  45 GIT_CHERRY_PICK_HELP="  After resolving the conflicts,
  46 mark the corrected paths with 'git add <paths>', and
  47 run 'git rebase --continue'"
  48 export GIT_CHERRY_PICK_HELP
  49
  50 warn () {
  51         echo "$*" >&2
  52 }
  53
  54 output () {
  55         case "$VERBOSE" in
  56         '')
  57                 output=$("$@" 2>&1 )
  58                 status=$?
  59                 test $status != 0 && printf "%s\n" "$output"
  60                 return $status
  61                 ;;
  62         *)
  63                 "$@"
  64                 ;;
  65         esac
  66 }
  67
  68 require_clean_work_tree () {
  69         # test if working tree is dirty
  70         git rev-parse --verify HEAD > /dev/null &&
  71         git update-index --ignore-submodules --refresh &&
  72         git diff-files --quiet --ignore-submodules &&
  73         git diff-index --cached --quiet HEAD --ignore-submodules -- ||
  74         die "Working tree is dirty"
  75 }
  76
  77 ORIG_REFLOG_ACTION="$GIT_REFLOG_ACTION"
  78
  79 comment_for_reflog () {
  80         case "$ORIG_REFLOG_ACTION" in
  81         ''|rebase*)
  82                 GIT_REFLOG_ACTION="rebase -i ($1)"
  83                 export GIT_REFLOG_ACTION
  84                 ;;
  85         esac
  86 }
  87
  88 last_count=
  89 mark_action_done () {
  90         sed -e 1q < "$TODO" >> "$DONE"
  91         sed -e 1d < "$TODO" >> "$TODO".new
  92         mv -f "$TODO".new "$TODO"
  93         count=$(grep -c '^[^#]' < "$DONE")
  94         total=$(($count+$(grep -c '^[^#]' < "$TODO")))
  95         if test "$last_count" != "$count"
  96         then
  97                 last_count=$count
  98                 printf "Rebasing (%d/%d)\r" $count $total
  99                 test -z "$VERBOSE" || echo
 100         fi
 101 }
 102
 103 make_patch () {
 104         parent_sha1=$(git rev-parse --verify "$1"^) ||
 105                 die "Cannot get patch for $1^"
 106         git diff-tree -p "$parent_sha1".."$1" > "$DOTEST"/patch
 107         test -f "$DOTEST"/message ||
 108                 git cat-file commit "$1" | sed "1,/^$/d" > "$DOTEST"/message
 109         test -f "$DOTEST"/author-script ||
 110                 get_author_ident_from_commit "$1" > "$DOTEST"/author-script
 111 }
 112
 113 die_with_patch () {
 114         make_patch "$1"
 115         git rerere
 116         die "$2"
 117 }
 118
 119 die_abort () {
 120         rm -rf "$DOTEST"
 121         die "$1"
 122 }
 123
 124 has_action () {
 125         grep '^[^#]' "$1" >/dev/null
 126 }
 127
 128 pick_one () {
 129         no_ff=
 130         case "$1" in -n) sha1=$2; no_ff=t ;; *) sha1=$1 ;; esac
 131         output git rev-parse --verify $sha1 || die "Invalid commit name: $sha1"
 132         test -d "$REWRITTEN" &&
 133                 pick_one_preserving_merges "$@" && return
 134         parent_sha1=$(git rev-parse --verify $sha1^) ||
 135                 die "Could not get the parent of $sha1"
 136         current_sha1=$(git rev-parse --verify HEAD)
 137         if test "$no_ff$current_sha1" = "$parent_sha1"; then
 138                 output git reset --hard $sha1
 139                 test "a$1" = a-n && output git reset --soft $current_sha1
 140                 sha1=$(git rev-parse --short $sha1)
 141                 output warn Fast forward to $sha1
 142         else
 143                 output git cherry-pick "$@"
 144         fi
 145 }
 146
 147 pick_one_preserving_merges () {
 148         fast_forward=t
 149         case "$1" in
 150         -n)
 151                 fast_forward=f
 152                 sha1=$2
 153                 ;;
 154         *)
 155                 sha1=$1
 156                 ;;
 157         esac
 158         sha1=$(git rev-parse $sha1)
 159
 160         if test -f "$DOTEST"/current-commit
 161         then
 162                 current_commit=$(cat "$DOTEST"/current-commit) &&
 163                 git rev-parse HEAD > "$REWRITTEN"/$current_commit &&
 164                 rm "$DOTEST"/current-commit ||
 165                 die "Cannot write current commit's replacement sha1"
 166         fi
 167
 168         echo $sha1 > "$DOTEST"/current-commit
 169
 170         # rewrite parents; if none were rewritten, we can fast-forward.
 171         new_parents=
 172         for p in $(git rev-list --parents -1 $sha1 | cut -d' ' -f2-)
 173         do
 174                 if test -f "$REWRITTEN"/$p
 175                 then
 176                         new_p=$(cat "$REWRITTEN"/$p)
 177                         test $p != $new_p && fast_forward=f
 178                         case "$new_parents" in
 179                         *$new_p*)
 180                                 ;; # do nothing; that parent is already there
 181                         *)
 182                                 new_parents="$new_parents $new_p"
 183                                 ;;
 184                         esac
 185                 else
 186                         new_parents="$new_parents $p"
 187                 fi
 188         done
 189         case $fast_forward in
 190         t)
 191                 output warn "Fast forward to $sha1"
 192                 output git reset --hard $sha1 ||
 193                         die "Cannot fast forward to $sha1"
 194                 ;;
 195         f)
 196                 test "a$1" = a-n && die "Refusing to squash a merge: $sha1"
 197
 198                 first_parent=$(expr "$new_parents" : ' \([^ ]*\)')
 199                 # detach HEAD to current parent
 200                 output git checkout $first_parent 2> /dev/null ||
 201                         die "Cannot move HEAD to $first_parent"
 202
 203                 case "$new_parents" in
 204                 ' '*' '*)
 205                         # redo merge
 206                         author_script=$(get_author_ident_from_commit $sha1)
 207                         eval "$author_script"
 208                         msg="$(git cat-file commit $sha1 | sed -e '1,/^$/d')"
 209                         # No point in merging the first parent, that's HEAD
 210                         new_parents=${new_parents# $first_parent}
 211                         if ! GIT_AUTHOR_NAME="$GIT_AUTHOR_NAME" \
 212                                 GIT_AUTHOR_EMAIL="$GIT_AUTHOR_EMAIL" \
 213                                 GIT_AUTHOR_DATE="$GIT_AUTHOR_DATE" \
 214                                 output git merge $STRATEGY -m "$msg" \
 215                                         $new_parents
 216                         then
 217                                 git rerere
 218                                 printf "%s\n" "$msg" > "$GIT_DIR"/MERGE_MSG
 219                                 die Error redoing merge $sha1
 220                         fi
 221                         ;;
 222                 *)
 223                         output git cherry-pick "$@" ||
 224                                 die_with_patch $sha1 "Could not pick $sha1"
 225                         ;;
 226                 esac
 227                 ;;
 228         esac
 229 }
 230
 231 nth_string () {
 232         case "$1" in
 233         *1[0-9]|*[04-9]) echo "$1"th;;
 234         *1) echo "$1"st;;
 235         *2) echo "$1"nd;;
 236         *3) echo "$1"rd;;
 237         esac
 238 }
 239
 240 make_squash_message () {
 241         if test -f "$SQUASH_MSG"; then
 242                 COUNT=$(($(sed -n "s/^# This is [^0-9]*\([1-9][0-9]*\).*/\1/p" \
 243                         < "$SQUASH_MSG" | sed -ne '$p')+1))
 244                 echo "# This is a combination of $COUNT commits."
 245                 sed -e 1d -e '2,/^./{
 246                         /^$/d
 247                 }' <"$SQUASH_MSG"
 248         else
 249                 COUNT=2
 250                 echo "# This is a combination of two commits."
 251                 echo "# The first commit's message is:"
 252                 echo
 253                 git cat-file commit HEAD | sed -e '1,/^$/d'
 254         fi
 255         echo
 256         echo "# This is the $(nth_string $COUNT) commit message:"
 257         echo
 258         git cat-file commit $1 | sed -e '1,/^$/d'
 259 }
 260
 261 peek_next_command () {
 262         sed -n "1s/ .*$//p" < "$TODO"
 263 }
 264
 265 do_next () {
 266         rm -f "$DOTEST"/message "$DOTEST"/author-script \
 267                 "$DOTEST"/amend || exit
 268         read command sha1 rest < "$TODO"
 269         case "$command" in
 270         '#'*|'')
 271                 mark_action_done
 272                 ;;
 273         pick|p)
 274                 comment_for_reflog pick
 275
 276                 mark_action_done
 277                 pick_one $sha1 ||
 278                         die_with_patch $sha1 "Could not apply $sha1... $rest"
 279                 ;;
 280         edit|e)
 281                 comment_for_reflog edit
 282
 283                 mark_action_done
 284                 pick_one $sha1 ||
 285                         die_with_patch $sha1 "Could not apply $sha1... $rest"
 286                 make_patch $sha1
 287                 : > "$DOTEST"/amend
 288                 warn "Stopped at $sha1... $rest"
 289                 warn "You can amend the commit now, with"
 290                 warn
 291                 warn "  git commit --amend"
 292                 warn
 293                 warn "Once you are satisfied with your changes, run"
 294                 warn
 295                 warn "  git rebase --continue"
 296                 warn
 297                 exit 0
 298                 ;;
 299         squash|s)
 300                 comment_for_reflog squash
 301
 302                 has_action "$DONE" ||
 303                         die "Cannot 'squash' without a previous commit"
 304
 305                 mark_action_done
 306                 make_squash_message $sha1 > "$MSG"
 307                 case "$(peek_next_command)" in
 308                 squash|s)
 309                         EDIT_COMMIT=
 310                         USE_OUTPUT=output
 311                         cp "$MSG" "$SQUASH_MSG"
 312                         ;;
 313                 *)
 314                         EDIT_COMMIT=-e
 315                         USE_OUTPUT=
 316                         rm -f "$SQUASH_MSG" || exit
 317                         ;;
 318                 esac
 319
 320                 failed=f
 321                 author_script=$(get_author_ident_from_commit HEAD)
 322                 output git reset --soft HEAD^
 323                 pick_one -n $sha1 || failed=t
 324                 echo "$author_script" > "$DOTEST"/author-script
 325                 if test $failed = f
 326                 then
 327                         # This is like --amend, but with a different message
 328                         eval "$author_script"
 329                         GIT_AUTHOR_NAME="$GIT_AUTHOR_NAME" \
 330                         GIT_AUTHOR_EMAIL="$GIT_AUTHOR_EMAIL" \
 331                         GIT_AUTHOR_DATE="$GIT_AUTHOR_DATE" \
 332                         $USE_OUTPUT git commit --no-verify -F "$MSG" $EDIT_COMMIT || failed=t
 333                 fi
 334                 if test $failed = t
 335                 then
 336                         cp "$MSG" "$GIT_DIR"/MERGE_MSG
 337                         warn
 338                         warn "Could not apply $sha1... $rest"
 339                         die_with_patch $sha1 ""
 340                 fi
 341                 ;;
 342         *)
 343                 warn "Unknown command: $command $sha1 $rest"
 344                 die_with_patch $sha1 "Please fix this in the file $TODO."
 345                 ;;
 346         esac
 347         test -s "$TODO" && return
 348
 349         comment_for_reflog finish &&
 350         HEADNAME=$(cat "$DOTEST"/head-name) &&
 351         OLDHEAD=$(cat "$DOTEST"/head) &&
 352         SHORTONTO=$(git rev-parse --short $(cat "$DOTEST"/onto)) &&
 353         if test -d "$REWRITTEN"
 354         then
 355                 test -f "$DOTEST"/current-commit &&
 356                         current_commit=$(cat "$DOTEST"/current-commit) &&
 357                         git rev-parse HEAD > "$REWRITTEN"/$current_commit
 358                 if test -f "$REWRITTEN"/$OLDHEAD
 359                 then
 360                         NEWHEAD=$(cat "$REWRITTEN"/$OLDHEAD)
 361                 else
 362                         NEWHEAD=$OLDHEAD
 363                 fi
 364         else
 365                 NEWHEAD=$(git rev-parse HEAD)
 366         fi &&
 367         case $HEADNAME in
 368         refs/*)
 369                 message="$GIT_REFLOG_ACTION: $HEADNAME onto $SHORTONTO)" &&
 370                 git update-ref -m "$message" $HEADNAME $NEWHEAD $OLDHEAD &&
 371                 git symbolic-ref HEAD $HEADNAME
 372                 ;;
 373         esac && {
 374                 test ! -f "$DOTEST"/verbose ||
 375                         git diff-tree --stat $(cat "$DOTEST"/head)..HEAD
 376         } &&
 377         rm -rf "$DOTEST" &&
 378         git gc --auto &&
 379         warn "Successfully rebased and updated $HEADNAME."
 380
 381         exit
 382 }
 383
 384 do_rest () {
 385         while :
 386         do
 387                 do_next
 388         done
 389 }
 390
 391 # check if no other options are set
 392 is_standalone () {
 393         test $# -eq 2 -a "$2" = '--' &&
 394         test -z "$ONTO" &&
 395         test -z "$PRESERVE_MERGES" &&
 396         test -z "$STRATEGY" &&
 397         test -z "$VERBOSE"
 398 }
 399
 400 get_saved_options () {
 401         test -d "$REWRITTEN" && PRESERVE_MERGES=t
 402         test -f "$DOTEST"/strategy && STRATEGY="$(cat "$DOTEST"/strategy)"
 403         test -f "$DOTEST"/verbose && VERBOSE=t
 404 }
 405
 406 while test $# != 0
 407 do
 408         case "$1" in
 409         --continue)
 410                 is_standalone "$@" || usage
 411                 get_saved_options
 412                 comment_for_reflog continue
 413
 414                 test -d "$DOTEST" || die "No interactive rebase running"
 415
 416                 # Sanity check
 417                 git rev-parse --verify HEAD >/dev/null ||
 418                         die "Cannot read HEAD"
 419                 git update-index --ignore-submodules --refresh &&
 420                         git diff-files --quiet --ignore-submodules ||
 421                         die "Working tree is dirty"
 422
 423                 # do we have anything to commit?
 424                 if git diff-index --cached --quiet --ignore-submodules HEAD --
 425                 then
 426                         : Nothing to commit -- skip this
 427                 else
 428                         . "$DOTEST"/author-script ||
 429                                 die "Cannot find the author identity"
 430                         if test -f "$DOTEST"/amend
 431                         then
 432                                 git reset --soft HEAD^ ||
 433                                 die "Cannot rewind the HEAD"
 434                         fi
 435                         export GIT_AUTHOR_NAME GIT_AUTHOR_EMAIL GIT_AUTHOR_DATE &&
 436                         git commit --no-verify -F "$DOTEST"/message -e ||
 437                         die "Could not commit staged changes."
 438                 fi
 439
 440                 require_clean_work_tree
 441                 do_rest
 442                 ;;
 443         --abort)
 444                 is_standalone "$@" || usage
 445                 get_saved_options
 446                 comment_for_reflog abort
 447
 448                 git rerere clear
 449                 test -d "$DOTEST" || die "No interactive rebase running"
 450
 451                 HEADNAME=$(cat "$DOTEST"/head-name)
 452                 HEAD=$(cat "$DOTEST"/head)
 453                 case $HEADNAME in
 454                 refs/*)
 455                         git symbolic-ref HEAD $HEADNAME
 456                         ;;
 457                 esac &&
 458                 output git reset --hard $HEAD &&
 459                 rm -rf "$DOTEST"
 460                 exit
 461                 ;;
 462         --skip)
 463                 is_standalone "$@" || usage
 464                 get_saved_options
 465                 comment_for_reflog skip
 466
 467                 git rerere clear
 468                 test -d "$DOTEST" || die "No interactive rebase running"
 469
 470                 output git reset --hard && do_rest
 471                 ;;
 472         -s)
 473                 case "$#,$1" in
 474                 *,*=*)
 475                         STRATEGY="-s "$(expr "z$1" : 'z-[^=]*=\(.*\)') ;;
 476                 1,*)
 477                         usage ;;
 478                 *)
 479                         STRATEGY="-s $2"
 480                         shift ;;
 481                 esac
 482                 ;;
 483         -m)
 484                 # we use merge anyway
 485                 ;;
 486         -v)
 487                 VERBOSE=t
 488                 ;;
 489         -p)
 490                 PRESERVE_MERGES=t
 491                 ;;
 492         -i)
 493                 # yeah, we know
 494                 ;;
 495         --onto)
 496                 shift
 497                 ONTO=$(git rev-parse --verify "$1") ||
 498                         die "Does not point to a valid commit: $1"
 499                 ;;
 500         --)
 501                 shift
 502                 test $# -eq 1 -o $# -eq 2 || usage
 503                 test -d "$DOTEST" &&
 504                         die "Interactive rebase already started"
 505
 506                 git var GIT_COMMITTER_IDENT >/dev/null ||
 507                         die "You need to set your committer info first"
 508
 509                 comment_for_reflog start
 510
 511                 require_clean_work_tree
 512
 513                 UPSTREAM=$(git rev-parse --verify "$1") || die "Invalid base"
 514                 test -z "$ONTO" && ONTO=$UPSTREAM
 515
 516                 if test ! -z "$2"
 517                 then
 518                         output git show-ref --verify --quiet "refs/heads/$2" ||
 519                                 die "Invalid branchname: $2"
 520                         output git checkout "$2" ||
 521                                 die "Could not checkout $2"
 522                 fi
 523
 524                 HEAD=$(git rev-parse --verify HEAD) || die "No HEAD?"
 525                 mkdir "$DOTEST" || die "Could not create temporary $DOTEST"
 526
 527                 : > "$DOTEST"/interactive || die "Could not mark as interactive"
 528                 git symbolic-ref HEAD > "$DOTEST"/head-name 2> /dev/null ||
 529                         echo "detached HEAD" > "$DOTEST"/head-name
 530
 531                 echo $HEAD > "$DOTEST"/head
 532                 echo $UPSTREAM > "$DOTEST"/upstream
 533                 echo $ONTO > "$DOTEST"/onto
 534                 test -z "$STRATEGY" || echo "$STRATEGY" > "$DOTEST"/strategy
 535                 test t = "$VERBOSE" && : > "$DOTEST"/verbose
 536                 if test t = "$PRESERVE_MERGES"
 537                 then
 538                         # $REWRITTEN contains files for each commit that is
 539                         # reachable by at least one merge base of $HEAD and
 540                         # $UPSTREAM. They are not necessarily rewritten, but
 541                         # their children might be.
 542                         # This ensures that commits on merged, but otherwise
 543                         # unrelated side branches are left alone. (Think "X"
 544                         # in the man page's example.)
 545                         mkdir "$REWRITTEN" &&
 546                         for c in $(git merge-base --all $HEAD $UPSTREAM)
 547                         do
 548                                 echo $ONTO > "$REWRITTEN"/$c ||
 549                                         die "Could not init rewritten commits"
 550                         done
 551                         MERGES_OPTION=
 552                 else
 553                         MERGES_OPTION=--no-merges
 554                 fi
 555
 556                 SHORTUPSTREAM=$(git rev-parse --short $UPSTREAM)
 557                 SHORTHEAD=$(git rev-parse --short $HEAD)
 558                 SHORTONTO=$(git rev-parse --short $ONTO)
 559                 git rev-list $MERGES_OPTION --pretty=oneline --abbrev-commit \
 560                         --abbrev=7 --reverse --left-right --cherry-pick \
 561                         $UPSTREAM...$HEAD | \
 562                         sed -n "s/^>/pick /p" > "$TODO"
 563                 cat >> "$TODO" << EOF
 564
 565 # Rebase $SHORTUPSTREAM..$SHORTHEAD onto $SHORTONTO
 566 #
 567 # Commands:
 568 #  p, pick = use commit
 569 #  e, edit = use commit, but stop for amending
 570 #  s, squash = use commit, but meld into previous commit
 571 #
 572 # If you remove a line here THAT COMMIT WILL BE LOST.
 573 # However, if you remove everything, the rebase will be aborted.
 574 #
 575 EOF
 576
 577                 has_action "$TODO" ||
 578                         die_abort "Nothing to do"
 579
 580                 cp "$TODO" "$TODO".backup
 581                 git_editor "$TODO" ||
 582                         die "Could not execute editor"
 583
 584                 has_action "$TODO" ||
 585                         die_abort "Nothing to do"
 586
 587                 git update-ref ORIG_HEAD $HEAD
 588                 output git checkout $ONTO && do_rest
 589                 ;;
 590         esac
 591         shift
 592 done